Water Vapor Transport to Henan's Extreme Rainfall with the Influence of Dual Typhoons:A FLEXPART-Modeling Study
WANG Deyang
YANG kai
CHEN Jinghua
ZHAO Tianliang
ZHANG Yuqing
LU Yanghao
LI Zhikuan
LU Zhen
Abstract：The"7.20"extreme rainfall event in Henan Province was characterized by prolonged duration and intense precipitation,causing disastrous damage.To investigate the key sources and transport pathways of water vapor during this extreme rainfall event,this study utilized multi-source meteorological data and the FLEXPART model to conduct trajectory simulations and analyze the water vapor transport processes.Additionally,cluster analysis was performed on the transport trajectories.The results revealed two primary water vapor pathways that significantly contributed moisture to the extreme precipitation event.The first pathway,originating from the Northwest Pacific typhoon"In-Fa",provided continuous water vapor transport toward Henan between 1 000 hPa and 700 hPa,with the core between 1 000 hPa and 900 hPa during July 19-21.The second pathway,from the South China Sea typhoon"Cempaka",transported water vapor on July 20,primarily between 950 hPa and 800 hPa.Topographic effects resulted in significant height differences between the two water vapor transport channels.The continuous accumulation of water vapor over Henan Province was an important factor in the formation of the extreme precipitation.The persistent transport of large amounts of vapor by the typhoons played a crucial role in sustaining the heavy rainfall,significantly contributing to the extreme precipitation event.
Keywords：extreme rainfall in Henan ProvinceFLEXPARTIVTVFDtyphoon
Publication Date：2026-02-28
Online Publishing Date：2026-03-25(First online date of this platform, not the publication date of the document)
Pages：11( 14-24 )